<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>

        /* id选择器>类选择器>标签选择器 */
        .c1{
            color: goldenrod;
        }

        /* 标签选择器 */
        div{
           color: red;
           font-size: 30px; 
        }
    </style>
</head>
<body>
    
    <div class="c1">
        div01
    </div>

    <div>
        div02
    </div>

    <div>
        div03
    </div>


</body>
</html>